Please roll this change back. If you add a custom class in src/main/java/your/package/CustomClass.java you will get ClassNotFoundException!
Currently (2.0.3) liquibase maven plugin fails to find classes in standard maven java classes folder.
<changeSet id="2" author="someone" >
<customChange class="your.package.CustomClass"/>
</changeSet>
I tested 2.0.0 and it works fine!